Proof? Read the ORB's. 315 Sqn was not present over Bergen, as you said they were elsewhere. The german fighters did not saw them either.
Polish 315 pilots not liked by RAF pilots, well depend on who you ask (and how you ask) but my impression is that was not liked that much. They was brave but difficult to work with.
Best
Olve Dybvig
www.luftwaffe.no